2003 LS Suburban flex 5.3 4x4 abs In drive 2wd the rear drive shaft spins. I know this is right. In 2wd the front drive shaft also spins? Mine does The transfer case control motor tells the front differential to go into 4 wheel drive when you push the 4WH? The front wheel drive actuator then tells the right and left drive shafts to connect to the transfer case and wheels and then 4 wheel drive occurs? My truck goes to two and 4 wheel easy with no issues and truck drives fine but right and left front two axles are spinning while in two or 4. I know I am in 2 or 4 by hitting gas a little on big snow patch and feeling what tires spin. No error codes. Shift buttons perform correctly. No noises Any help appreciated on educating me so I may purchase the correct part.